Don't know i'm posting the question to right forum. We have configured NLB in two of our servers (A & B). And we have hosted a web service in those servers (A & B) and can be accessed by using a VIP. Everything works fine no issue. The problem is if I switch off IIS in A server then i'm not able to access the webservice with that virutal address. i.e it's not routing to Server B . I'm getting a error "No connection can be made as target server actively refused <VIP>" But i'm able to ping the server. Any thoughts ?

Hi Trivier, Thanks for posting here. Which OS running in this scenario ? have you set port rule ? and it’s appreciate that if could you first discuss on how did set this NLB up and parameters ? Network Load Balancing is not load balancing applications, and the default host handles all network traffic. http://technet.microsoft.com/en-us/library/cc781160(WS.10).aspx#BKMK_15 http://social.technet.microsoft.com/Forums/en-US/winserverClustering/thread/278c1174-0e88-4df4-8a8b-1be0533e8385/ Thanks. Tiger Li Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Thanks for your reply Tiger appreciated. It's Asmx. Let me give you more details. We have two webserver (A & B) with 2 NIC's each. One for lan and another one for NLB. Administrator configured add those nodes into a NLB cluster with VIP. Config Details affinity: single mode: unicast windows 2008 R2 My webservice is an secure ( https://) When I switch off IIS in Node B and access https://<VIP>/webservice.asmx for a common machine in the same domain it works. When I switch off IIS in node A and switch on Node B and hit the https://<VIP>/webservice.asmx I’m not able to browse/access the webservice. I have installed Fiddler for debug purpose it comes up with an error “No connection can be made as target server actively refused <VIP>” But I’m able browse the VIP from node B (IIS switch off state) i.e browse without webservice.asmx (http://<VIP>) that mean I’m able to see the VIP isn’t? Another thing is if I physical login into Node B and hit https://<VIP>/webservice.asmx it WORKS may be request coming from local host?

http://support.microsoft.com/kb/313299 (How to load balance a Web server farm by using one SSL certificate in IIS 6.0 and in IIS 5.0) pls refer this linkDarshana Jayathilake

mine is IIS 7.0 anyway it doesn't matter even non-secure website is also not working. I have added one more host into my NLB cluster (thought node B may be having some issues). Even that doesn't work. Something wrong in my NLB configuration may be. Is there any way to debug what's going wrong in the NLB?

Hi Trivier, Thanks for update. Yes, this is why I was suspect and suggest to double check the current NLB port rules settings to make sure it was been properly set : Network Load Balancing parameters http://technet.microsoft.com/en-us/library/cc778263(WS.10).aspx Network Load Balancing Deployment Guide http://technet.microsoft.com/en-us/library/cc754833(WS.10).aspx And we have some great articles that discussed on NLB deployment could be found under “NLB” tag of Microsoft Enterprise Networking Team blog site: http://blogs.technet.com/b/networking/archive/tags/nlb/ Thanks. Tiger LiPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

thanks tiger li for your response. I will give it go. Whilst does the configuration change if it is virtual servers? In my case my 2 servers are virtual.

Hi Trivier, Thanks for update. May I know which VM software are you using now ? please pay attention on the physical address we bind for virtual networking interfaces if we are using Hyper-V: http://blogs.technet.com/b/networking/archive/2010/02/12/cannot-access-the-virtual-or-dedicated-ip-address-of-an-nlb-node-guest-running-in-unicast-mode-on-windows-server-2008-r2-hyper-v.aspx Thanks. Tiger LiPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.